07-13-2012, 04:52 PM | #1 |
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Kindle 4NT battery drain
I have a Kindle 4NT that seems to have normal battery life in use (lasts close to a month when I read daily) but drains faster than it should when "off" and stored. Twice now I have pulled it from a bag after a month or so not being used with the battery dead. The device was "off" with the 7 second press both times, nothing indexing, wireless off. Battery was fully charged when I stored it.
Can anyone think of why this would drain like this? Even if it were somehow accidentally turned "on" by having the button pressed when the bag moved it would then go to sleep and still shouldn't drain so fast right? A Touch I am borrowing has sat just as long and the battery barely changed from full. Last edited by heeby; 07-13-2012 at 05:00 PM. |
07-14-2012, 01:40 AM | #2 |
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I would call that odd. Maybe try a factory reset first to see if it solves the problem. If not time to call for a replacement.
My K4 does not do that I get about two weeks charge with my usual reading habits. |
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07-14-2012, 08:08 AM | #3 |
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To be clear when I use it there is no issue with battery life. 3 weeks plus. This issue is when I have turned it off and stored it for a month or so. I cannot think of why it would drain just sitting when it functions fine in use.
I will replace the battery myself before I will send it back and risk getting a green screen. But as it works when reading without excessive drain it makes me think it's not the battery itself. |
07-14-2012, 08:13 AM | #4 | |
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Quote:
Did you leave wireless on when you "turned off" your kindle? |
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07-14-2012, 08:15 AM | #5 | |
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Did you have wireless on when you "turned it off"? Good luck with replacing the battery. It has a soft shell and is glued into the K4 with a much stronger glue than is used to glue on the back cover. Trying to remove the battery is likely to destroy it (perhaps starting a lithium fire). Not recommended. What is a kindle "green screen"? Last edited by geekmaster; 07-14-2012 at 09:52 AM. |
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07-14-2012, 09:12 AM | #6 |
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All K4s are still under warranty. Why not contact Kindle CS and get it replaced?
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07-14-2012, 09:14 AM | #7 |
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Geekmaster did you read my original post?
Wireless off, nothing indexing, turned "off" with the seven second press. In another post recently where I asked a tutorial on changing the battery was linked and it is possible. Green screen is the poor quality greenish screen with low contrast that plagues a lot of Kindles due to crap quality control. I went through several before I got a beautiful screen. |
07-14-2012, 09:16 AM | #8 |
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07-14-2012, 09:51 AM | #9 |
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Not according to RainingLemur's post and the linked video.
https://www.mobileread.com/forums/sho...d.php?t=184747 |
07-14-2012, 09:52 AM | #10 |
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Well, on your own head be it! Please do let us know the outcome.
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07-14-2012, 09:57 AM | #11 | |
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I would love to read about how they changed the battery. When I tried lifting my battery it was stretching the battery wrapper almost to the point of tearing, but the glue did not budge. Perhaps they are using different glue now. Please provide a link to your K4 battery removal reference. Thanks. EDIT: Nevermind. Found it: http://www.youtube.com/watch?v=JO1Tg2OsPjU Hmm... There is no FREAKING way that MY battery would come out like that. I tried. Besides, after removing his battery you could see 5 scratches on the glue. He had already removed it before. In the video it was not even glued in (except for slight stickiness of the remaining glue). They want to make it look easier than it is to sell more battery replacements... I suspect that they may have HEATED the battery the first time, enough to melt the glue (which may also damage the battery if it gets too hot). Also, some K4s may have more glue, or stronger glue. Last edited by geekmaster; 07-14-2012 at 10:09 AM. |
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07-14-2012, 10:15 AM | #12 |
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Yeah the post I linked to above was a result of me asking if anyone had see a way to do it. The tear downs I saw before said it wouldn't work but I figured it would be a matter of time before someone figured out a way. I am not going to do it now but it's good to know it's an option even if potentially difficult. I worked to hard to get good quality screens to gamble on a refurb being clear enough.
I would like to figure out why my batteries drain faster when off and not being used than when in actual use. It's weird. I get normal life when reading regularly...but when stored for a month "off" as off can be it totally drains. They were sitting on a shelf for months before being sold and retained a partial charge..but stored like that in a suitcase they drain so fast? Also my devices are unregistered and have had wifi off since I bought them so I can't imagine there is any phoning home going on. |
07-14-2012, 11:04 AM | #13 |
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It is normal for a fully charged lithium battery to self-discharge relatively quickly. For longest battery life and longer storage, they should be discharged to less than 70% (and preferably 40%) before storing them. This can be done in diagnostics, using the "shipping mode" diag. There is also a script that can do it for you. It takes awhile...
In fact, mission-critical batteries are NEVER charged more than 70%. This gives them a MUCH longer lifespan, but requires recharging more often during usage. Internally, they are the same as consumer batteries charged to 100% (for longer time between charges), but they are labelled and rated differently, requiring different charging methods. |
07-14-2012, 11:09 AM | #14 |
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Can I set that mode via the device through some commands? How do I enter the "diagnostics" screen?
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07-14-2012, 11:24 AM | #15 | |
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Quote:
WARNING! TECHNICAL DETAILS AHEAD! Spoiler:
Last edited by geekmaster; 07-14-2012 at 01:27 PM. |
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